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<pre class="textdiagram" id="fig6">
+---------+   +---------+   +---------+
|  PUSH   |   |  PUSH   |   |  PUSH   |
\----+----/   \----+----/   \----+----/
     |             |             |
 R1, R2, R3       R4           R5, R6
     |             |             |
     +-------------+-------------+
                   |
             fair-queuing
         R1, R4, R5, R2, R6, R3
                   |
                   v
            /-------------\
            |     PULL    |
            +-------------+
</pre>
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